The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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Seamless Mode Transfer of Indirect Current Controlled Parallel Grid-Connected Inverters

간접전류제어방식 병렬형 계통연계 인버터의 무순단 모드절환

  • Song, Injong (School of Electrical Eng., Chungbuk National University) ;
  • Choi, Junsoo (School of Electrical Eng., Chungbuk National University) ;
  • Lim, Kyungbae (WooJin Industrial System Co. Ltd) ;
  • Choi, Jaeho (School of Electrical Eng., Chungbuk National University)
  • Received : 2019.01.31
  • Accepted : 2019.04.26
  • Published : 2019.10.20
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Abstract

This study proposes the control strategy for the seamless mode transfer of indirect current controlled parallel grid-connected inverters. Under the abnormal grid condition, the grid-connected inverter can convert the operation mode from grid-connected to stand-alone mode to supply power to the local load. For a seamless mode transfer, the time delay problems caused by the accumulated control variable error must be solved, and the indirect current control method has been applied as one of the solutions. In this study, the design of control parameters for the proportional-resonant-based triple-loop indirect current controller and the control strategy for the seamless mode transfer of parallel grid-connected inverters are described and analyzed. The validity of the proposed mode transfer method is verified by the PSiM simulation results.

Keywords

Acknowledgement

Supported by : 한국에너지기술평가원 (KETEP)

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